2020 Jha Iffco Aonla Shortening of Bimetallic Urea Stripper In-situ TTS Welding

The bimetallic strippers in urea units were in service for last 20~21 years. Stripper length had been shortened by 40 mm and bottom side tube to tube sheet new weld joints were performed by keeping 18 mm protrusion as against 5 mm in original equipment. This paper highlights the unique job of stripper shortening instead of replacement, to regain its reliability and extend its life by few years at a meagre cost of less than 10% of new equipment. The repair procedures for shortening of urea strippers and difficulties faced during job execution have been described.


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